:root {
  /* surfaces (from your design system idea) */
  --surface: #f9f9f7;
  --surface-low: #f2f4f2;
  --surface-high: #e5e9e6;
  --surface-lowest: #ffffff;

  /* colors */
  --primary: #5f5e5e;
  --primary-dim: #535252;
  --on-primary: #faf7f6;
  --on-surface: #2d3432;
  --on-surface-variant: #5a605e;
  --outline-variant: #adb3b0;
  --error: #9f403d;

  /* font */
  --font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-serif: "Noto Serif", "Times New Roman", serif;

  /* layout */
  --gutter: 1.25rem;
}

/* body modes */
body.surface {
  margin: 0;
  min-height: 100vh;
  background: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-sans);
}

/* typography helpers */
.headline {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  line-height: 1.1;
  margin: 0 0 0.6rem;
}

.body-lg {
  font-size: 1rem;
}

.muted {
  color: var(--on-surface-variant);
  
}

.eyebrow {
  letter-spacing: 0.3em;
  font-size: 0.9rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

/* screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Onboarding overlay */
.onboarding-overlay {
  position: fixed;
  inset: 0;
  background: rgba(12, 15, 14, 0.7);
  backdrop-filter: blur(24px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.onboarding-panel {
  background: var(--surface-lowest);
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 680px;
  width: min(680px, 100% - 2.5rem);
  padding: 2.5rem 2.5rem 2rem;
  max-height: 90vh;
  overflow-y: auto;
}

.onboarding-header {
  padding-bottom: 1.5rem;
  border-bottom: 1px solid rgba(173, 179, 176, 0.25);
  margin-bottom: 1.5rem;
}

.onboarding-body {
  display: flex;
  flex-direction: column;
  gap: 2.1rem;
}

.onb-section {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.section-label {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.8rem;
  font-weight: 600;
  margin: 0;
  color: var(--on-surface-variant);
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--outline-variant);
  background: var(--surface-lowest);
}

.onb-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(173, 179, 176, 0.2);
}

.age-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  flex-direction: row;
}

.card {
  background: var(--surface-lowest);
  padding: 0.8rem 0.9rem 0.9rem;
  border: none;
  cursor: pointer;
  text-align: left;
}

.card:hover {
  background: var(--surface-low);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  margin: 0 0 0.2rem;
}

.card-subtitle {
  font-size: 0.8rem;
  margin: 0;
  color: var(--on-surface-variant);
}

/* radio selected state */
.radio-card[aria-checked="true"],
.radio-chip[aria-checked="true"] {
  outline: 2px solid var(--primary);
  outline-offset: -2px;
  background: #e3dfd9;
}


/* chips for age */
.chip {
  display:flex;
  flex-direction: column; 
  align-items: flex-start;
  gap: 8px; 
  background: var(--surface-lowest);
  padding: 0.8rem;
  border: none;
  font-size: 1.1rem;
  text-align: left;
  font-weight: 500;
  font-family: var(--font-serif);
  cursor: pointer;
}

.chip:hover {
  background: var(--surface-low);
}

/* SVG flag in lang cards */
.flag svg {
  width: 2.2rem;
  height: 1.5rem;
  display: block;
  margin-bottom: 0.35rem;
}

/* SVG icons in persona cards */
.card-icon {
  width: 3.2rem;
  height: 3.2rem;
  color: var(--on-surface-variant);
  margin-bottom: 0.35rem;
  display: block;
}

.radio-card[aria-checked="true"] .card-icon {
  color: var(--primary);
}

/* SVG icons in age chips */
.chip-icon {
  width: 2.2rem;
  height: 2.2rem;
  color: var(--on-surface-variant);
  margin-bottom: 0.2rem;
  display: inline-block;
}

.age-title {
  display: inline-block;
}

.radio-chip[aria-checked="true"] .chip-icon {
  color: var(--primary);
}

.onb-footer {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 2.5rem;  
  padding-top: 1.2rem;
  border-top: 1px solid rgba(173, 179, 176, 0.25);
}

.hint-muted {
  font-style: italic;  
  font-size: 0.85rem;
  color: var(--on-surface-variant);
  margin: 0;
  
}

/* Buttons base */
.btn-primary,
.btn-secondary {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  border: 1px solid rgba(173, 179, 176, 0.35);
}

/* Primary button follows gradient rule */
.btn-primary {
  background: linear-gradient(
    120deg,
    var(--primary),
    var(--primary-dim)
  );
  color: var(--on-primary);
  height: 2.9rem;
  padding: 0 1.6rem;
  font-weight: 600;
}

.btn-primary:disabled {
  opacity: 0.45;
  cursor: default;
}

.btn-secondary {
  background: var(--surface-low);
  color: var(--on-surface);
  height: 2.9rem;
  padding: 0 1.6rem;
  font-size: 0.85rem;
}

.btn-secondary:hover {
  background: var(--surface-high);
}

.wide {
  width: 100%;
}

/* App shell */
.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Top bar */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 0.9rem var(--gutter);
  background: rgba(249, 249, 247, 0.96);
  backdrop-filter: blur(16px);
}

.top-left {
  display: flex;
  margin: 2rem 0;
  flex-direction: column;
  gap: 0.2rem;

}

.app-title {
  border: 0;
  background: transparent;
  padding: 0;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  letter-spacing: 0.2em;
  color: inherit;
  cursor: pointer;
  text-align: left;
}

.app-title:hover {
  text-decoration: underline;
  text-underline-offset: 0.25rem;
}

.app-title:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 4px;
}

.top-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* language group */
.lang-group {
  display: flex;
  gap: 0.25rem;
}

.lang-btn {
  background: transparent;
  padding: 0.25rem 0.55rem;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.lang-btn.active {
  background: var(--surface-low);
  color: var(--on-surface);
}

/* ── AUDIO CONTROLS ───────────────────────────────────────── */
.top-right {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.audio-group {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 0.22rem; 
}

.v.volume-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: var(--surface-low);
  border-radius: 2rem;
  padding: 0.48rem 0.85rem;
  min-height: 3rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.volume-icon {
  font-size: 1.05rem;
  color: var(--on-surface-variant);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.volume-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 122px;   
  height: 6px;    
  border-radius: 999px;
  background: rgba(173, 179, 176, 0.75);
  outline: none;
  display: block;
}

.volume-slider::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(173, 179, 176, 0.75);
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;    /* bolita más gorda */
  height: 18px;
  border-radius: 50%;
  background: var(--surface-lowest);
  border: 1px solid rgba(173, 179, 176, 0.75);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.16);
  cursor: pointer;
  margin-top: -6px; /* alinea la bolita con el centro del track */
}

.volume-slider::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(173, 179, 176, 0.75);
}

.volume-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--surface-lowest);
  border: 1px solid rgba(173, 179, 176, 0.75);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.16);
  cursor: pointer;
}

.icon-btn {
  width: 3rem;
  height: 3rem;
  background: var(--surface-low);
  border-radius: 50%;
  color: var(--on-surface-variant);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.615);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: background 0.15s;
  border: 1px solid rgba(173, 179, 176, 0.35);
}

.icon-btn:hover {
  background: var(--surface-high);
}

.icon-btn.is-listening {
  background: var(--error);
  color: var(--on-primary);
}

.icon-btn:disabled {
  cursor: default;
  opacity: 0.7;
}

/* ── SPEED GROUP ──────────────────────────────────────────── */
.speed-group {
  display: flex;
  background: var(--surface-low);
  border-radius: 2rem;
  padding: 0.2rem;
  gap: 0.1rem;
}

.speed-btn {
  padding: 0.3rem 0.75rem;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  background: none;
  color: var(--on-surface-variant);
  border-radius: 2rem;
  transition: background 0.15s, color 0.15s;
  border: none;
  cursor: pointer;
}

.speed-btn.active,
.speed-btn[aria-checked="true"] {
  background: var(--surface-lowest);
  color: var(--on-surface);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.615);
}

.speed-btn:hover {
  background: var(--surface-high);
}

/* Layout main */
.main-layout {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(220px, 0.9fr);
  gap: 1rem;
  padding: 1rem var(--gutter) 6rem;
}

/* Chat panel */
.chat-panel {
  background: var(--surface-lowest);
  padding: 1rem 1.1rem 0.9rem;
  display: flex;
  flex-direction: column;
  min-height: 300px;
  max-height: calc(100vh - 210px);
}

.chat-thread {
  flex: 1;
  overflow-y: auto;
  padding-right: 0.4rem;
}

.msg-row {
  display: flex;
  margin-bottom: 0.7rem;
}

.msg-row.assistant {
  justify-content: flex-start;
}

.msg-row.user {
  justify-content: flex-end;
}

.msg-bubble {
  max-width: 80%;
  padding: 0.7rem 0.9rem;
  font-size: 0.95rem;
  white-space: pre-wrap;
}

/* bubbles with good contrast */
.assistant-bubble {
  background: #ece6dd;
  color: var(--on-surface);
}

.user-bubble {
  background: #c4b498;
  color: #111111;
}

/* typing indicator */
#typing-indicator {
  display: none !important;
}

#typing-indicator.is-visible {
  display: inline-flex !important;
  gap: 0.22rem;
  height: 1rem;
  margin: 0.3rem 0;
}

#typing-indicator[hidden] {
  display: none !important;
}

#typing-indicator span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #b3aa9b;
  animation: typing 1.2s infinite ease-in-out;
}

#typing-indicator span:nth-child(2) {
  animation-delay: 0.15s;
}

#typing-indicator span:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes typing {
  0%,
  80%,
  100% {
    opacity: 0.3;
    transform: translateY(0);
  }

  40% {
    opacity: 1;
    transform: translateY(-2px);
  }
}

/* suggestions */
.suggestion-row {
  margin-top: 0.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.suggestion-btn {
  border: none;
  background: var(--surface-low);
  padding: 0.4rem 0.7rem;
  font-size: 0.8rem;
  cursor: pointer;
}

/* Context column */
.context-column {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.context-box {
  background: var(--surface-lowest);
  padding: 0.9rem 0.9rem 0.8rem;
}

.context-heading {
  font-size: 0.95rem;
  margin: 0 0 0.4rem;
}

.field-label {
  font-size: 0.8rem;
  margin: 0.5rem 0 0.1rem;
}

.field-select {
  width: 100%;
  border: none;
  border-bottom: 1px solid rgba(173, 179, 176, 0.5);
  padding: 0.4rem 0;
  background: transparent;
  font-size: 0.9rem;
}

.field-help {
  font-size: 0.75rem;
  margin: 0.1rem 0 0;
}

.field-error {
  font-size: 0.8rem;
  color: var(--error);
  margin: 0.3rem 0 0;
}

.field-select[aria-invalid="true"] {
  border-bottom-color: var(--error);
}

.context-suggestion {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--on-surface-variant);
}

.link-btn {
  border: none;
  background: none;
  color: var(--primary);
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
}

/* bottom bar */
.bottom-bar {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: 100%;
  max-width: 1200px;
  padding: 0.4rem var(--gutter) 0.6rem;
  background: linear-gradient(
    to top,
    rgba(249, 249, 247, 0.96),
    transparent
  );
}

.helper-text {
  font-size: 0.8rem;
  margin: 2 2 2 2;
}

.input-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--surface-lowest);
  padding: 0.4rem 0.5rem 0.4rem 0.8rem;
}

.chat-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 0.95rem;
}

.input-shell.is-transcribing .chat-input {
  color: transparent;
  caret-color: transparent;
}

.input-shell.is-transcribing .chat-input::placeholder {
  color: transparent;
}

.chat-input:disabled {
  cursor: wait;
}

.voice-input-status {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--on-surface);
  font-size: 0.95rem;
  font-weight: 700;
  pointer-events: none;
}

.voice-input-status[hidden] {
  display: none !important;
}

.voice-input-dots {
  height: 0.8rem;
  margin: 0;
}

.voice-input-dots span {
  background: var(--on-surface-variant);
}

.voice-status {
  color: var(--error);
  font-size: 0.82rem;
  font-weight: 600;
  min-width: 6rem;
}

.voice-status[hidden] {
  display: none;
}

/* focus outlines */
button:focus-visible,
[role="radio"]:focus-visible,
select:focus-visible,
.chat-input:focus-visible {
  outline: 3px solid #0044aa;
  outline-offset: 2px;
}

/* Elderly mode */
body[data-mode="senior"] {
  font-size: 1.05rem;
}

/* bigger targets in senior */
body[data-mode="senior"] button,
body[data-mode="senior"] .chip {
  min-height: 3rem;
}

body[data-mode="senior"] .suggestion-row {
  flex-direction: column;
}

body[data-mode="senior"] .suggestion-btn {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
}

body[data-mode="senior"] .helper-text {
  font-size: 0.95rem;
}

body[data-mode="senior"] .msg-bubble {
  font-size: 1.05rem;
}

/* responsiveness */
@media (max-width: 880px) {
  .onboarding-panel {
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
  }

  .main-layout {
    grid-template-columns: minmax(0, 1fr);
    padding-bottom: 6rem;
  }

  .context-column {
    order: -1;
  }

  .top-bar {
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
  }

  .top-right {
    align-self: flex-end;
  }

  .chat-panel {
    max-height: calc(100vh - 240px);
  }
}

.onboarding-step[hidden] {
  display: none;
}

.step-header {
  display: flex;
  justify-content: flex-start;
  margin-bottom: 0.1rem;
}

.step-count {
  font-size: 0.85rem;
  color: var(--on-surface-variant);
  margin: 0;
}

/* barra base */
.step-bar {
  width: 100%;
  height: 5px;
  background: var(--surface-high);
  border-radius: 999px;
  overflow: hidden;
}

/* progreso */
.step-bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 999px;
  transition: width 0.3s ease;
}

.step-help {
  margin: 0;
  font-size: 0.95rem;
}

.onb-actions {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.onb-actions > button {
  flex: 1;
}

.toggle-list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.toggle-row {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.95rem 1rem;
  background: var(--surface-lowest);
  border: 1px solid rgba(173, 179, 176, 0.35);
  cursor: pointer;
}

.toggle-row:hover {
  background: var(--surface-low);
}

.toggle-row input {
  margin-top: 0.2rem;
  inline-size: 1.1rem;
  block-size: 1.1rem;
}

.toggle-content {
  display: flex;
  flex-direction: column;
}

.info-block {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  padding: 1rem;
  background: var(--surface-low);
  border: 1px solid rgba(173, 179, 176, 0.35);
}

.info-block p {
  margin: 0;
  line-height: 1.5;
}

.consent-row {
  margin-top: 0.8rem;
}

@media (max-width: 880px) {
  .onb-actions {
    flex-direction: column;
  }
}